if i share on accesspoint a few QVW file to view using the IE-plugin. Do all users that only view the application need some kind of license? if so then i need to make the platform private cause if all users can view the application and need a license that would be a huge amount of licenses.

You should note that there are many types of CAL available and you should explore the options with your vendor to see what options suit your requirements.

If you need to lock the documents down, a quick option is to create a Windows security group and set this as having secuirty on the files that you want to open and remove anything else. Then add the users that you want to have access into this group.